Wow even the lore forums has been infected with necromancy.

No I don't think there has been anyone explicitly said to be gay since the wanderer's palace hm questline, hints possibly (via jokes to us etc) like "Stupid sexy Roedygyn" guy and the other hot spring male duo in that place but nothing outright stated.

WoLsexuals can be whatever depending on your gender G'raha Tia is gay for my main character but straight for 1 of my alts for example (I take G'raha's affection as sign of a crush).